Upgrading your CDB - Amazon Relational Database Service
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Upgrading your CDB

You can upgrade a CDB to a different Oracle Database release. For example, you can upgrade an Oracle Database 19c CDB to an Oracle Database 21c CDB. You can't change the database architecture during an upgrade. Thus, you can't upgrade a non-CDB to a CDB or upgrade a CDB to a non-CDB.

The procedure for upgrading a CDB to a CDB is the same as for upgrading a non-CDB to a non-CDB. For more information, see Upgrading the RDS for Oracle DB engine.